(a) What is the enthalpy change needed to change 3 kg of liquid water at 0°C to steam at 0.1 MPa and 150°C?

(b) What is the enthalpy change needed to heat 3 kg of water from 0.4 MPa and 0°C to steam at 0.1 MPa and 150°C?

(c) What is the enthalpy change needed to heat 1 kg of water at 0.4 MPa and 4°C to steam at 150°C and 0.4 MPa?

(d) What is the enthalpy change needed to change 1 kg of water of a water-steam mixture of 60% quality to one of 80% quality if the mixture is at 150°C?

(e) Calculate the ΔH value for an isobaric change of steam from 0.8 MPa and 250°C to saturated liquid.

(f) Repeat part (e) for an isothermal change to saturated liquid.

(g) Does a state change from saturated vapor at 230°C to the state 100°C and 0.05 MPa represent an enthalpy increase or decrease? A volume increase or decrease?

(h) In what state is water at 0.2 MPa and 120.21°C? At 0.5 MPa and 151.83°C? At 0.5 MPa and 153°C?

(i) A 0.15 m³ tank containing 1 kg of water at 1 MPa and 179.88°C has how many m3 of liquid water in it? Could it contain 5 kg of water under these conditions?

(j) What is the volume change when 2 kg of H₂O at 6.8 MPa and 93°C expands to 1.6 bar and 250°C?

(k) Ten kg of wet steam at 0.75 MPa has an enthalpy of 22,000 kJ. Find the quality of the wet steam.